Proceedings of the Physical Society, Volum 16Institute of Physics and the Physical Society., 1899 |
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Altres edicions - Mostra-ho tot
Proceedings of the Physical Society, Volums 1-2 Institute of Physics and the Physical Society Visualització completa - 1876 |
Proceedings of the Physical Society, Volums 18-19 Institute of Physics and the Physical Society Visualització completa - 1904 |
Proceedings of the Physical Society, Volum 18 Institute of Physics and the Physical Society Visualització completa - 1902 |
Frases i termes més freqüents
alcohol alloy amperes amplitude apparatus approximately attenuation axis Ayrton benzene calculated carbon tetrachloride cent centim centre circuit Clark cell coefficient coil constant copper corresponding curve cylinder damping deflexion density difference diffusion distance effect electric electromotive force equal equation error experimental experiments flux formula frequency galvanometer given heat Hence hysteresis induction instrument iridium isopentane Joule-Thomson effect length light liquid Lord Lord Rayleigh magnetic maximum means measured metal meter method millim mixtures observed obtained ohms ordinary paper pendulum pentane phenol Phil Physical Society plate platinum poles position potential potentiometer pressure Prof quantity ratio reflexion resistance rhodium search-coil SHELFORD BIDWELL shown slit solution spherometer substance surface Table temperature thermo-couple toluene tube vapour vapour-pressure velocity vibrations volts volume wave-length waves wire zero
Passatges populars
Pàgina 305 - K is the radius of gyration of the cross section of the rod about its axis. This was established by a strict elastic solid method for an elliptic section, and in a somewhat less rigid way for a rectangular section. (A) and (B) were confined, like the investigations of Lord Rayleigh and Professor Pochhammer, to isotropic materials.
Pàgina 145 - ... prismatic deviation) of such a kind that the refraction is increased below (that is, on the red side of) the band and diminished above it. An analogy may be traced here with the repulsion between two periods which frequently occurs in vibrating systems. The effect of a pendulum suspended from a body subject to horizontal vibration is to increase or diminish the virtual inertia of the mass according as the natural period of the pendulum is shorter or longer than that of its point of suspension....
Pàgina 251 - ... of two electric-motors coupled in such a way as to admit of their rotating at different speeds. The two shafts are placed in line, and each is fitted with a bevel-wheel, gearing into an intermediate wheel. The axis of the intermediate wheel is at right angles to the line of the motor-shafts, and is free to rotate in a plane at right angles to that line. The motors can be made to rotate at different speeds by altering the strength of the magnets of either or both. The motion of the intermediate...
Pàgina 26 - He found that for any gas. kept at the same initial temperatur , the cooling effects were proportional to the difference of pressure on the two sides of the plug.
Pàgina 256 - RA, said that, apart from ils electrical merits, the machine possessed advantages in mechanical construction. He thought there was still room for improvement in this respect. The counter-shaft should be done away with, and ball-bearings should be introduced. The inductor was a distinct improvement ; he thought the efficiency might be increased by adding other inductors. Platinum-iridium was the best material for brushes of such machines. Prof. Ayrton asked what efficiency was obtained with modern...
Pàgina 10 - Such an apparatus could be made with a set of small mirrors arranged in such a manner as to direct two images of the distant object into an eye-piece, with a fixed prism in the path of one of the incident beams. By sliding this instrument along the optical bench one position could always be found at which the two images, as seen through the eye-piece, were in coincidence. He also described a method for determining curvature by interposing a plate of plane glass between the curved mirror and a source...
Pàgina 288 - Rayleigh's formula, I think it must be because the real circumstances do not correspond closely enough to those in the ideal theory. The external resistance of unknown amount is ignored, for one thing. Then, again, it is not to be certainly expected that the formula in question is true for millions of vibrations per second. We can conclude from the experiments, though, that it furnishes an approximation to the real resistance. But, even if it were rigorously true, the circumstances implied in it...
Pàgina 490 - ... of volatile substance is dissolved in a liquid the vapour pressure of the liquid is altered in the ratio of the molecular fractional amount of solvent in the liquid to that in the vapour. In order to test this formula, it has been applied to the results of experiments made on four series of liquids, viz. alcohol with benzene and toluene, and carbon tetrachloride with benzene and toluene. In the case of normal solutions, such as carbon tetrachloride in toluene, carbon tetrachloride in benzene,...
Pàgina 113 - ... be incorrect, but the zero of the scale is liable to change during use. The Chatelier pyrometer has been used with satisfaction at the Massachusetts Institute of Technology for measuring temperatures in flues and chimneys. It consists essentially of a thermoelectric couple made by joining the ends of two wires, one of platinum and the other of platinum alloyed with 10 per cent of rhodium.
Pàgina 257 - Pidgeon had departed from this. The advantage of the narrow spacing of the sectors was not very apparent. Mr. Wimshurst (abstract of communication) : Waxing the discs reduces leakage, and increases the output ; the wax-coating virtually doubles the number of plates. Inductors contribute a further increase to the output. In 1883 Mr. Wimshurst tried thick coatings of shellac, and also, duplicating the glass, with in some cases sectors upon the second glass to increase the capacity. The output was increased,...